Originally Posted by
SASless
President Trump has legal and executive authority under US and International Law to do as he did.
It may not be popular, and might even be the wrong thing to do...but he is within his authority.
The terms of the Agreement (Treaty if you wish....) facilitate any individual Nation a part of the Agreement to cite issues and take action if it feels there was not a proper response to those concerns.
Yale Journal of International Law | Is the Trump Administration Bound by the Iran Deal?
Iran as per the body monitoring the agreement was keeping to it. Israel didn't like it, US administration bowed to what Israel wanted. This is what everybody sees and everybody reads.
US decided that it could do what it wanted and break its previous agreement. It then demand everybody else follow its steps or they would sanction any business doing trade with Iran and start and economic blockade. Now even its own friends realise that any agreement with US is breakable by them whenever a politician wants to do it. A Treaty means nothing because the next President can just walk away from it.
US doesn't need to worry about its enemies, they will always be there, its friends however are the ones who openly wonder what US is doing. UK will always be a lapdog but rest of EU see blocking of pipelines etc as nothing more than a move to corner the market.